<template>
  <div>
    <span v-for="(val, index) in arr" :key="index">
      <input type="checkbox" v-model="newArr" :value="val" /><span>{{
        val
      }}</span>
    </span>
    <div>你选中的元素，累加的值的和为：{{ he }}</div>
  </div>
</template>

<script>
export default {
  data() {
    return {
      arr: [9, 15, 19, 25, 29, 31, 48, 57, 62, 79, 87],
      newArr: [],
    };
  },
  computed: {
    he() {
      return this.newArr.reduce((sum, obj) => (sum += obj), 0);
    },
  },
};
</script>

<style>
</style>